CN1886575A - Hydraulic circuit used for longwall face removal - Google Patents

Hydraulic circuit used for longwall face removal Download PDF

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Publication number
CN1886575A
CN1886575A CNA2004800353116A CN200480035311A CN1886575A CN 1886575 A CN1886575 A CN 1886575A CN A2004800353116 A CNA2004800353116 A CN A2004800353116A CN 200480035311 A CN200480035311 A CN 200480035311A CN 1886575 A CN1886575 A CN 1886575A
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CN
China
Prior art keywords
pressure
pump
valve
power transmitter
line
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CNA2004800353116A
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Chinese (zh)
Inventor
W·屈塞尔
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tiefenbach Bergbautechnik GmbH
Tiefenbach Control Systems GmbH
Original Assignee
Tiefenbach Bergbautechnik GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Tiefenbach Bergbautechnik GmbH filed Critical Tiefenbach Bergbautechnik GmbH
Publication of CN1886575A publication Critical patent/CN1886575A/en
Pending legal-status Critical Current

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B20/00Safety arrangements for fluid actuator systems; Applications of safety devices in fluid actuator systems; Emergency measures for fluid actuator systems
    • F15B20/004Fluid pressure supply failure
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D23/00Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor
    • E21D23/16Hydraulic or pneumatic features, e.g. circuits, arrangement or adaptation of valves, setting or retracting devices
    • E21D23/26Hydraulic or pneumatic control
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/16Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00Circuits for servomotor systems
    • F15B2211/30Directional control
    • F15B2211/305Directional control characterised by the type of valves
    • F15B2211/30505Non-return valves, i.e. check valves
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00Circuits for servomotor systems
    • F15B2211/30Directional control
    • F15B2211/305Directional control characterised by the type of valves
    • F15B2211/30505Non-return valves, i.e. check valves
    • F15B2211/30515Load holding valves
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00Circuits for servomotor systems
    • F15B2211/30Directional control
    • F15B2211/305Directional control characterised by the type of valves
    • F15B2211/30525Directional control valves, e.g. 4/3-directional control valve
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00Circuits for servomotor systems
    • F15B2211/30Directional control
    • F15B2211/32Directional control characterised by the type of actuation
    • F15B2211/327Directional control characterised by the type of actuation electrically or electronically
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00Circuits for servomotor systems
    • F15B2211/30Directional control
    • F15B2211/32Directional control characterised by the type of actuation
    • F15B2211/329Directional control characterised by the type of actuation actuated by fluid pressure
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00Circuits for servomotor systems
    • F15B2211/60Circuit components or control therefor
    • F15B2211/63Electronic controllers
    • F15B2211/6303Electronic controllers using input signals
    • F15B2211/6306Electronic controllers using input signals representing a pressure
    • F15B2211/6309Electronic controllers using input signals representing a pressure the pressure being a pressure source supply pressure
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00Circuits for servomotor systems
    • F15B2211/70Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/71Multiple output members, e.g. multiple hydraulic motors or cylinders
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00Circuits for servomotor systems
    • F15B2211/80Other types of control related to particular problems or conditions
    • F15B2211/86Control during or prevention of abnormal conditions
    • F15B2211/863Control during or prevention of abnormal conditions the abnormal condition being a hydraulic or pneumatic failure

Abstract

The invention relates to a hydraulic circuit used for longwall face removal, comprising a plurality of supports (shields). In said circuit, the hydraulically actuated power transmitters (cylinder/plunger units (4)) and their associated hydraulic control valves (pilot valves (16) and main valves (17)) are connected to a pump line (1)) and pump branch line and to a return line (2) and return branch line. The pump branch line is equipped with a check valve (9), which blocks the direction of flow from the respective power transmitter to the pump line and which can be actuated for blocking purposes independently of the activation and selector position of the hydraulic control valves. Said check valve is preferably a non-return valve, which blocks the direction of flow from the respective power transmitter (4) to the pump line (1).

Description

The hydraulic circuit that is used for force piece
Technical field
The present invention relates to a kind of hydraulic circuit that is used for force piece (Strebausbau) as described in the preamble according to claim 1.
Background technology
Such loop generally is known and in use.This relates to by self pressure controlled hydraulic means.The pump pressure that also uses hydraulic circuit in these hydraulic means is to be used to implement the hydraulic pressure pwc control of valve.This processing method is accomplished in support control.It allows in work plane only just enough with two supply lines.In contrast, externally produce the pre-control instruction of hydraulic pressure in Kong Zhi the system via the control valve that is independent of load pressure or pump pressure work that separates, supply with this control valve pressure medium via independent pressure piping.The backflow guiding device of the certain one whole control volumes that separate also belongs to such system.Also improve the expense of pipe-line system thus.Fault location is very difficult when breaking down, and is influencing each other that operating pressure is supplied with and pre-controlled pressure is supplied with because can not get rid of two pressure feeds.Valve arrangement since operating pressure and pre-controlled pressure what separate need also be very big especially in regard to the expense on pressure balance and the Sealing Technology.
On the other hand; even in mining engineering high safety standards in self pressure controlled hydraulic means since be in a large amount of control element in the work plane and switch element particularly control valve and load support the extremely high complexity of valve, aspect safeguard measure, also cause very big expending.The hydraulic means that is used for the backplate support in this respect in principle must guarantee that although a large amount of possible duties comprises unallowed duty or unexpected fault, the personnel that work in the down-hole still can rest under the backplate safely in the work plane zone.
Although these safeguard measures notice, when pump operated breaking down the power transmitter (Kraftgeber) (operating cylinder) of a backplate and after in short-term the operating cylinder of other backplates also make a concession so that rock may sink.
Summary of the invention
The objective of the invention is, design is present in self pressure controlled hydraulic means that pass through in the use, makes it this seriously and fault costliness can not occur, and wherein the additional configurations to conventional device also is possible, and does not have significant reconstruction expense.
According to the solution of claim 1 based on the knowledge of not expecting, although the i.e. emergency cut-off of whole electricity and control hydraulic pressure under the situation that pump installation breaks down, still produce unexpected duty, wherein the pressure dependence of Shi Xianing still enough is used for hydraulic pressure pwc control, that is opens important valve.
Shut off valve of the present invention can be for example changes this pressure sensor testing pump pressure by a pressure sensor cutting out on the meaning.The conversion that shut off valve is opened in realization when existing pressure to fall from the pump branch line to operating cylinder under any circumstance.
Form of implementation according to claim 2 is characterised in that, its do not need outside control and therefore on the one hand operation be reliably, also additional configurations easily on the other hand.
Favourable effect according to the measure of claim 1 or 2 is unexpected.This can illustrate like this that promptly when pump operated breaking down, it causes a power transmitter to descend, and forms a retaining pressure in return line, and this retaining pressure in particular concerns the backplate (support) of direct relation.Because in this case, that is the load pressure that is caused by rock under the situation of the high retaining pressure in backflow may be lower and because fault and can not utilize pump pressure, so the pressure on the load maintaining valve is reduced to below the threshold, open unexpected conversion and decline that load is supported valve and also may cause the power transmitter on contiguous backplate this moment.Owing to stop the unexpected rising of the pressure that in the pump line road pre-control is worked, so also stop the decline of the near bracket of a support that relates to by false transitions by shut off valve of the present invention.
Description of drawings
Below by means of an embodiment the present invention is described.Wherein:
The hydraulic circuit of Fig. 1 one work plane;
Fig. 2 is used for each valve of a power transmitter of a support.
The specific embodiment
Each mark in the accompanying drawing is represented:
1 work plane supply line (pump-pipeline that confluxes, feeding), it extends and is connected in unshowned pumping plant along the part of work plane or work plane total length;
2 return lines (pipeline that refluxes-conflux, reflux) that conflux, the fuel tank that it extends and be connected in pumping plant along a part or the work plane total length of face length;
3 are used for the hydraulic control device of a power transmitter.This hydraulic control device is connected in feeding and is connected in backflow via backflow branch line 13 via feeding branch line 12;
4 one power transmitters are expressed as oil cylinder-plunger assembly here;
5 controller for electric consumption (backplate control) are used for controlling hydraulic control device.It receives the operational order from central work plane control device 15;
6 one at the shut off valve that constitutes flap valve 6 in the backflow branch line 13 of each backplate, and it is closed from the through-flow direction of backflow collecting pipe road direction hydraulic control device.
A plurality of valves belong to hydraulic control device.These valves are shown in the schematic diagram by Fig. 2.Conflux be connected (the pump branch line) of pipeline of each power transmitter and the pump of work plane closed by a flap valve 14 in principle, thereby the support pressure of power transmitter relied on the flap valve of tight seal when pump pressure loses efficacy.But when being lower than by the predetermined value of valve arrangement, the pressure differential of load pressure and pre-controlled pressure can open this flap valve 14 by pre-control according to the hydraulic pressure of system pressure.Flap valve 14 hydraulic pressure convert to make at the exert oneself working space of transmitter of the situation of hydraulic open and are connected in the pipeline that confluxes that refluxes via the backflow branch line.This openable flap valve is known by DE 38 04 848 A1 for example.
By shut off valve of the present invention 6 now this be used as load support valve flap valve 14 open (rises) unintentionally the time prevention pressure medium enter the pump line road from the cylinder chamber of power transmitter.Therefore be closed in the pump branch line between power transmitter and the pump busway.Spacing with one or more supports in pump confluxes pipeline (work plane supply line 1) is provided with a plurality of pressure sensors 7.These pressure sensors guarantee under any circumstance to exist in pump confluxes pipeline the minimum pressure of a regulation for example 200 to cling to.Otherwise take place, connect backplate by means of this electric fixtures 5 and handle opening circuit of electric fixtures 5.Therefore when not reaching the minimum pressure of 200 crust, stop to connect and be used for the electric fixtures that backplate is handled.
Pressure sensor 8 in confluxing pipeline, is set in backflow.For example along three such pressure sensors 8 of face length distribution.These sensors are monitored the maximum pressure that is no more than a regulation and for example 30 are clung in backflow.These sensors 8 cut out electronic equipment 5 when reaching the maximum pressure of 30 crust, thereby valve manipulation no longer is possible.
May take place this moment, and appearance one pressure falls or a pressure liter occurs in pipeline is confluxed in backflow in pump confluxes pipeline, goes up at one or more backplates (support) simultaneously to exist the electricity that is used for a transfer process to instruct.Though transfer process is interrupted in this case, but still keep electric conversion instruction and reach one the regulation stress level the time be activated again.Therefore each valve enters the uncertain position of the switch.One such pressure fall may be for example since the inefficacy of pump or pumping plant cause.Therefore may take place, the working piston in such power transmitter descends, and it operates in when finishing a cradling function and has been interrupted.The result of this decline is the corresponding rising that has a large amount of liquid and retaining pressure in backflow, and reduces load pressure on the other hand, borrows it that openable flap valve 14 is remained on its fastening position.What cause flap valve thus still continues the danger of opening, and closes needed pressure dependence because descend and no longer remain during the return pressure rising at load pressure.
When pump pressure in pump confluxes pipeline reduces on openable flap valve 14, exist to the pump pressure of opening direction and because the floating position of pre-control valve is controlled piston in advance is pressed towards and opens direction, a similarly dangerous situation occurs.Perhaps cause opening of flap valve in this case, the load space of power transmitter is connected in the pump pipeline that confluxes thus.Thus the power transmitter play pump and the inefficacy of ignoring pumping plant to the pump pipeline supply pressure medium that confluxes, this causes when having the signal of telecommunication in pump confluxes pipeline again from this moment of elevated pressure once more, and its pre-controlled pressure as the conversion of the valve that is close to backplate is enough.Thus along with the sinking chain-react of the whole backplates that cause a work plane.
This is stoped by each shut off valve 9, and it is present in pump and confluxes in the branch line between pipeline and the hydraulic control device 3.
Also uncertain hydraulic pressure situation may take place like this, promptly the pressure in the long pump of hundreds of rice confluxes pipeline is not elevated to rapidly and is enough on the one hand the valve of pre-control be changed in the process that pump is reset, and pump pressure is not enough to support the load of rock on the other hand.The decline of operating cylinder also may take place in this case.In pump confluxes pipeline, controllable shut off valve 10 is installed for this reason with a plurality of for example spacings of three backplates, they when pump starts at first be close and start once more successively and open by the central electronic control device of work plane.Reach thus, pressure takes place in each segmentation of work plane when being right after each segmentation of opening work plane successively and mutually soon set up, each segmentation is divided by sequence closing valve 10.One bypass valve (work plane feather valve 11) can be set in this external pumping plant, by this valve if pump still carry and therefore do not reach enough conveying capacities yet to fuel tank starting it.
Therefore avoid the situation of danger by also applicable and effective other the measure of the present invention and itself, wherein when changing magnet valve and in work plane, lacking pump pressure, set up unique public being connected to whole control device of work plane.In each valve, take place in this case through-flow because pump lost efficacy or during low excessively pump pressure the system pressure monitoring be inactive.This causes each valve to allow a volume flow that continues feed confluxing return line and opens load and support valve (openable flap valve) when reaching the critical controlled pressure limit.What here incur danger especially is the plunger that pressure is not set or only is provided with small pressure, because load supports the pressure of opening of valve to depend on load pressure, as mentioned above.Equally, its tensile force of hydraulic pressure unloading depends on that the load support valve of spring force has the enough pressure of opening and for example only 40 clings to, and does not have load pressure.
Stop the volume of backplate plunger and oil cylinder under the state of load that is stressed, to play a part by shut off valve 9 as pump, though it is one reverse and to inadequate supply of contiguous backplate that it causes under low excessively pressure, load takes place under lower load pressure there then to be supported the effective control of valve and opens, this discharges additional volume again, and it causes the chain reaction that continues.
List of numerals
1 working face supply line 1
2 return lines 2 that conflux
3 backplate control device, hydraulic control device, controll block 3
4 power transmitters, oil cylinder-plunger assembly 4
5 controller for electric consumption 5
6 flap valve 6
7 pressure sensors 7
8 pressure sensors 8
9 shut off valves, flap valve 9
10 sequence closing valves 10
11 work plane feather valves 11
12 feeding branch lines 12
13 backflow branch lines 13
14 load are supported valve, openable flap valve 14
15 central work plane control device 15
16 pre-control valves 16
17 main valves 17
18 pressure limiting valves 18

Claims (3)

1. be used to comprise the hydraulic circuit of the force piece of many supports (backplate), each support is especially in use in the cradling function aspect that the support that supports rock reclaims and set up aspect cradling function be steerable; This hydraulic circuit comprises:
Hydraulic operated power transmitter (oil cylinder/plunger assembly 4), they are attached troops to a unit in each support in order to implement for the needed work functions of cradling function;
The control valve of hydraulic pressure (pre-control valve 16 and main valve 17), they can operate and attach troops to a unit respectively in a power transmitter so that hydraulic pressure triggers the work functions of power transmitter and is connected with this power transmitter hydraulic pressure by the control instruction that sends to its electromagnet; And
Each backplate control device (3) is used for each support (backplate), so that by the support instruction triggers control instruction that can import the cradling function aspect in each backplate control device;
One pump line road is used for the pressure medium supply of whole power transmitters, and this pump line road is connected in a power transmitter or one group of power transmitter via each pump branch line;
One return line, be used to discharge the pressure medium of strong transmitter, this return line is connected in a power transmitter or one group of power transmitter via each backflow branch line;
It is characterized in that: in the pump branch line, have a shut off valve (9), close from the through-flow direction of corresponding power transmitter, and this shut off valve can irrespectively be operated to closing direction with the control and the position of the switch of hydraulic control valve to the pump line road.
2. according to the described hydraulic circuit of claim 1, it is characterized in that: shut off valve is a flap valve, and it is closed from the through-flow direction of corresponding power transmitter to the pump line road.
3. according to the described hydraulic circuit of claim 1, it is characterized in that: in pump confluxes pipeline, with the spacing of one or more backplates a plurality of controllable sequence closing valves (10) are installed respectively, they can be controlled like this by the central electronic control device of work plane, promptly each sequence closing valve (10) when pump starts at first be close and and then connected successively and opened.
According to the described hydraulic circuit of claim 1, it is characterized in that: the spacing with one or more supports is monitored predetermined minimum pressure that exists and/or the predetermined maximum pressure that exists by pressure sensor (8,7) in pipeline is confluxed in backflow in pump confluxes pipeline (work plane supply line 1), these pressure sensors are connected in controller for electric consumption (5) so that open circuit.
CNA2004800353116A 2003-11-29 2004-11-18 Hydraulic circuit used for longwall face removal Pending CN1886575A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10356421 2003-11-29
DE10356421.7 2003-11-29

Publications (1)

Publication Number Publication Date
CN1886575A true CN1886575A (en) 2006-12-27

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Application Number Title Priority Date Filing Date
CNA2004800353116A Pending CN1886575A (en) 2003-11-29 2004-11-18 Hydraulic circuit used for longwall face removal

Country Status (7)

Country Link
US (1) US7478884B2 (en)
CN (1) CN1886575A (en)
AU (1) AU2004295371B2 (en)
DE (1) DE112004002056D2 (en)
PL (1) PL203380B1 (en)
RU (1) RU2337243C2 (en)
WO (1) WO2005054629A1 (en)

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CN101818649A (en) * 2010-05-15 2010-09-01 张小康 Hydraulic supporting device for fully-mechanized coal driving workface
CN101893007A (en) * 2010-07-23 2010-11-24 吴旭 Plunger case lifting hydraulic control system
CN101413395B (en) * 2007-10-16 2011-06-01 玛珂系统分析和开发有限公司 Valve arrangement
CN102713149A (en) * 2009-07-16 2012-10-03 迪芬巴赫控制系统股份有限公司 Hydraulic circuit for longwall mining
CN105386784A (en) * 2015-12-07 2016-03-09 太原科技大学 Liquid supply loop of hydraulic supports and control method
CN105545836A (en) * 2016-01-28 2016-05-04 河南骏通车辆有限公司 Subframe leveling hydraulic control system for leveling of dumper

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CN101413395B (en) * 2007-10-16 2011-06-01 玛珂系统分析和开发有限公司 Valve arrangement
CN102713149A (en) * 2009-07-16 2012-10-03 迪芬巴赫控制系统股份有限公司 Hydraulic circuit for longwall mining
CN102713149B (en) * 2009-07-16 2015-04-01 迪芬巴赫控制系统股份有限公司 Hydraulic circuit for mining face trestle
CN101818649A (en) * 2010-05-15 2010-09-01 张小康 Hydraulic supporting device for fully-mechanized coal driving workface
CN101818649B (en) * 2010-05-15 2011-09-28 张小康 Hydraulic supporting device for fully-mechanized coal driving workface
CN101893007A (en) * 2010-07-23 2010-11-24 吴旭 Plunger case lifting hydraulic control system
CN105386784A (en) * 2015-12-07 2016-03-09 太原科技大学 Liquid supply loop of hydraulic supports and control method
CN105545836A (en) * 2016-01-28 2016-05-04 河南骏通车辆有限公司 Subframe leveling hydraulic control system for leveling of dumper

Also Published As

Publication number Publication date
RU2337243C2 (en) 2008-10-27
PL379765A1 (en) 2006-11-13
AU2004295371B2 (en) 2009-07-16
PL203380B1 (en) 2009-09-30
AU2004295371A1 (en) 2005-06-16
US7478884B2 (en) 2009-01-20
WO2005054629A1 (en) 2005-06-16
DE112004002056D2 (en) 2006-07-13
US20070044647A1 (en) 2007-03-01
RU2006123004A (en) 2008-01-10

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